深度图像之前的cine MR指纹与B1+旋转历史校正
Jesse I Hamilton1,2, Gastão Lima da Cruz1, Imran Rashid3,4
1Department of Radiology, University of Michigan, Ann Arbor, Michigan, USA.
Magnetic resonance in medicine
|December 15, 2023
概括
一种用于心磁共振指纹 (MRF) 的新型深度图像前 (DIP) 重建改进了B1+校正的2D电影成像. 这种方法提高了参数映射精度和噪声抑制,以获得更好的诊断洞察力.
科学领域:
- 生物医学成像技术 生物医学成像技术
- 磁共振成像技术 磁共振成像技术
- 量化MRI是指数量化的MRI.
背景情况:
- 心脏磁共振指纹 (MRF) 能够同时对组织特性进行定量测绘.
- 现有的MRF重建方法可能受到噪声和运动工件的限制,影响诊断准确度.
- 准确的B1+场映射对于纠正定量MRI中的射频传输不均性至关重要.
研究的目的:
- 开发和评估基于B1+校正的2D电影MRF的深度图像先前 (DIP) 重建.
- 为了生成心脏相位解析的参数图 (T1,T2,M0) 以提高准确度和精度.
- 评估DIP重建的性能,包括有效B1+估计 (DIP-B1) 的扩展,在健康人群中.
主要方法:
- 一种新的方法,将低级 (LR) 建模与DIP结合起来,用于在低样本螺旋k空间数据上进行自我监督的训练.
- 两个DIP实现:一个用于T1,T2,M0映射 (DIP),另一个包含有效的B1+估计 (DIP-B1).
- 将DIP和DIP-B1重建与LR,LRMC,以及已建立的定量MRI技术 (MOLLI,T2-prep bSSFP) 的比较.
主要成果:
- 与LR和LRMC相比,DIP和DIP-B1的重建表明了优越的噪音抑制和高分辨率细节.
- DIP-B1在T1/T2 (2.3%/8.3%) 实现了最低的细分内部变化和跨细分变化 (2.6%/4.1%),表明空间均性得到改善.
- 使用cine MRF地图对心室功能的量化显示,与参考cine测量相比,射出分数的平均偏差为-1.1%.
结论:
- 深度图像预先 (DIP) 重建对于二维电影MRF是有效的,能够精确地绘制T1,T2,M0的心脏相位分辨率映射,以及有效的B1+.
- DIP-B1方法显著改善了定量参数图中的噪声抑制和空间均性.
- 这种先进的重建技术为心脏MRI提供了更高的精度,优于传统的LR和LRMC方法.
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